Unusual annulation reaction of electron-deficient alkenes with enamines: an easy access to stereocontrolled 4-fluoroalkylated 3,4-dihydro-2H-pyrans
作者:Atsunori Morigaki、Kazuki Tsukade、Satoru Arimitsu、Tsutomu Konno、Toshio Kubota
DOI:10.1016/j.tet.2012.12.012
日期:2013.2
The reaction of β-fluoroalkylated α,β-unsaturated ketones with various enamines gave 4-fluoroalkylated 3,4-dihydro-2H-pyrans as a major product in good yields by a one-pot operation, and these products display the high diastereoselection just after single recrystallization. This unexpected result is rationalized by the unique reactivity of β-fluoroalkylated α,β-unsaturated ketones. As the synthetic
β-α氟烷基的反应,与各种烯胺β不饱和酮得到4-氟烷基-3,4-二氢-2 ħ -pyrans如良好的产率通过一个单罐操作的主要产物,而这些产品显示高diastereoselection在单次重结晶后。通过β-氟代烷基化的α,β-不饱和酮的独特反应性可以合理化这一出乎意料的结果。作为合成应用,以中等分离的收率和高非对映选择性合成了4-三氟甲基四氢吡喃。